XCON: HP Openmail Users Cannot Reply to SMTP Mail (168738)
The information in this article applies to:
- Microsoft Exchange Server 4.0
- Microsoft Exchange Server 5.0
This article was previously published under Q168738 SYMPTOMS
If mail is sent from an Internet user to an X.400 Mail system through the
following path
Exchange IMC -> Exchange -> Exchange X.400 Connector
the reply is returned as non-deliverable. In other words, you receive a non-
delivery report (NDR).
CAUSE
Because the recipient on the X.400 system is not in the Microsoft Exchange
Server global address list, the Internet Mail Connector (IMC) encapsulates
the recipient's address. This encapsulation is normally stripped by another
IMC later in the message path. However, in this particular scenario, there
is no other IMC. Thus, the Microsoft Exchange Server message transfer agent
(MTA) passes the encapsulation through as an additional Domain Defined
Attribute (DDA) attribute. On the reply, the IMC does not recognize the DDA
attribute, and returns the reply as non-deliverable.
WORKAROUND
Add the users on the receiving X.400 mail system to the global address
list.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 4.0. This problem has been corrected in the latest U.S. Service
Pack for Microsoft Exchange Server version 4.0. For information on
obtaining the Service Pack, query on the following word in the Microsoft
Knowledge Base (without the spaces):
Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.0. This problem has been corrected in the latest U.S. Service
Pack for Microsoft Exchange Server version 5.0. For information on
obtaining the service pack, query on the following word in the Microsoft
Knowledge Base (without the spaces):
MORE INFORMATION
The X.400 Mail System recipient can look at details of the Internet message
for the sender and will see an additional DDA attribute of MSXENCAP:SMTP.
The DDA type is MSXENCAP and the DDA value is SMTP. This issue is resolved
by stripping off this DDA information. The recipient might also notice that
the NDR from the reply is generated from the IMC, and that details on the
To: line resolve to a correct SMTP address. This occurs because the IMC
uses the P2 header information in the NDR, but uses the P1 information to
actually try to process the message.
| Modification Type: | Minor | Last Reviewed: | 4/28/2005 |
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| Keywords: | kbbug kbfix KB168738 |
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